Air-relief for fan discharge-pipes



(N0 Mudel.)

A. 0. LYNCH & G. W. GHRISTOPH. AIR RELIEF FOB, PAN DISCHARGE PIPES.

No. 547,793. Patented Oct. 15, 1895.

ANDREW B.GRAHAM. PHOTD-LITHO WASHINGTDN.D C

Nrrnn STATRs ARTHUR C. LYNCH, on NEW YORK, N. Y., AND GEORGE w. oIIRIsToPII, or HARTFORD, CONNECTICUT.

AIR-RELIEF FOR FAN DISCHARGE-PIPES.

SPECIFICATION fdrming part of Letters Patent No. 547,793, dated October 15, 1895. Application filed February 5,1895. Serial No. 537,331. (Nomodah) To all whom it may conaernr and the discharge-pipe is proportionately Be it known that we, ARTHUR O. LYNCH, large. After a suitable column of air for colresiding at New York, in the county of New lecting and conveying the material has been York and State of New York, and GEORGE set in motion and the particles of material 55 W. CHRISTOPH, residing at Hartford, in the being removed are under sufficient headway county of Hartford and State of Connecticut, in the discharge-pipe, if the pressure of air is citizens of the United States, have invented relieved, so that there will be no undue friccertain new and useful Improvements in an tion on the pipes, the particles can be com- Air-Relief for Fan Discharge-Pipes, of which pacted, reduced in volume, or made to 00- 60 the following is a specification. cupy less space by decreasing the size of the The invention relates to the dischargepipe, and this effects a saving in piping and pipes of fans, blowers, exhausters, or other enables the material to be better handled air-current producers that are placed in woodwith a smaller expenditure of power than working factories, saw and planingmills, polwith the use of a continuously-large discharge 65 ishing and buffing rooms, foundries, sugarand delivery pipe. To enable such a reduc houses, pulp and paper mills, dye-houses, fertion in the size of the discharge-pipe, so that tilizer-works, shoe-factories, and such places the delivery-pipe may be smaller and so that for removing odors, dust, chips, shavings, less power will be required for blowing the and other particles which are cut, disintematerial a distance to the outlet at the de- 70 2o grated, abraded, or otherwise result from the sired locality, the relief or air-escape 6 is operation of the tools or machines. located in the discharge-pipe, preferably no The object of the invention is to provide a great distance from the fan. relief or air-escape for the discharge-pipes of The relief or air-escape may be formed by such fans, so as to reducethe amount of air bending a portion of the discharge-pipeor an 75 required to be blown completely through the independent section of pipe attached to the discharge-pipes, thereby economizing power discharge-pipe into a circular coil and openand also enabling the better and easier handing a part of the coiled portion of the pipe ling and disposition of the dust, shavings, in any desired manner, preferably by cutting chips, lint, wool, or other cut, disintegrated, away either a part or all of the walls around 8o or abraded particles which are collected by the inside of the circle, so that it communithe fans. cates with a central cylindrical drum or cham- Referring to the accompanying drawings, her 7, that usually has an inward-projecting Figure 1 is a diagram view of an exhaust and cover 8 with a central opening 9. This secblower pipe system provided with the air-retion of pipe, which may be of any desired 85 5 lief. Fig. 2 is an enlarged plan of the air-renumber of coils, preferably is made rectanlief. Fig. 8 is an edge View of the relief, and gular in cross-section and tapering from the Fig. 4 is a section of the same. size of the discharge-pipe to the desired size In the views, 1 indicates a fan, blower, exof the delivery-pipe 10, that leads from this hauster, or otherair-currentproducer, of comair-relief to any localitywhere it is desired 0 mon form and construction, which may be that the particles of material conveyed by run by any ordinary means. Into this fan the air-currents shall be delivered. opens a suction-pipe 2, that has branch pipes With the fan in operation all dust, chips, 3, leading from the collectors 4c, placed in the shavings, lint, wool, or other particles that proper position adjacent to the several tools result from the operation or use of the tools 95 5 or machines the resulting chips or dust of or machines to which the collectors are apwhich it is desired to collect and deliver at a plied is collected through the branch pipes distance. From the fan leads the dischargeand the suction-pipe and then blown into the pipe 5. The suction-pipe is, of course, of sufdischarge-pipe. As the air-currents, laden ficient size to enable the fan to economically with the particles which are being conveyed mo move the necessary amount of air for collectaway, reach the coil of the relief and move ing the particles of material to be removed, around it, the particles travel close to the outside wall and pass into the reduced deliverypipe. The inertia or centrifugal motion first imparted to the particles causes them to hug the outside wall of the circular part of the discharge-pipe or relief in such manner that none escape into the cylindrical drum or chamber; but as the size of the dischargepipe is decreased and the space occupied or volume of solid-matter particles is reduced all of the air that is blown from the fan into the discharge-pipe cannot pass into the reduced delivery-pipe without causing great friction and back-pressu re. This excess of air escapes from the coil into the cylindrical drum, from which it passes out through the opening in the top wall or cover.

The cylindrical drum shown in the drawings has parallel side walls and is entirely closed at the bottom and nearly closed at the top by a re-entrant portion which has a central opening. If the material, such as chips or shavings, which is being rapidly driven by the aircurrents through the discharge-tube does not happen the first time to pass out through the reduced end of the coiled portion, or if the particles collide or bound against the side walls in such manner as to be thrown out of the tube into the central drum, they are kept in there until the suction of the whirling air that passes around through the tube again draws the particles into the tube and sends them on into the discharge-pipe. Of course, when drawing chips or shavings the volume is not always equal, as sometimes there will be more and sometimes less chips, and if there is such a large volume of shavings or chips at any one time that all cannotor do not pass out of the reduced outlet-tube the portion that thus cannot pass out will be crowded into the drum and it will revolve around until the tube has cleared itself, and then will in turn pass on when the congestion is reduced, for the material that accidentally or otherwise escapes from the coiled portion of the tube into the drum cannot drop out of the drum onto the floor of the department in which the device is located. Bymeansofthisarrangementthedelivery-pipe can be very much reduced in size, causingasaving of material and a reductionof space occupied, and this also enables a better control of the material, for when condensed in volume it can be more easily handled,while the power necessary to operate the fan and blow the particles is also reduced, for less air will be required to blow the material the distance required. The excess air which could not enter the reduced delivery-pipe without much increasing the power required to force it through freely escapes without the heavy particles through the air-relief, as described, and the solid particles continue their movement to-the end of the delivery-pipe whether it be at the door of a furnace or at a refuse heap.

'We claim as our invention- 1. In combination with a fan, a discharge pipe for such fan having an inlet end and a discharge end that is smaller in cross sectional area than the inlet end, said pipe being formed into a coil between the inlet end and the discharge end with a cylindrical drum located within the coiled portion, and a part of the inner wall of the coiled portion of the discharge pipe being open into the drum, substantially as specified.

2. In combination with a fan, a discharge pipe for such fan having an inlet end and a discharge end, said pipe being formed into a coil between the inlet end and the discharge end and said coil being gradually reduced in cross sectional area as it extends toward the discharge end, with a cylindrical drum located within the coiled portion, and a part of the inner wall of the coiled portion of the discharge pipe being open into the drum, substantially as specified.

In combination with a fan, a discharge pipe for such fan having an inlet end and a discharge end that is smaller in cross sectional area than the inlet end, said pipe being formed into a single coil between the inlet end and the discharge end, with a cylindrical drum having an opening through one end only located within the coiled portion, and a part of the inner wall of the coiled portion of the discharge pipe being open into the drum, substantially as specified.

4. In combination with a fan, a discharge pipe for such fan having an inlet end and a discharge end that is smallerin cross sectional area than theinlet end, said pipe being formed into acoil between the inlet end and the discharge end, with acylindrical drum having a re-entrant perforated top and a closed bottom located within the coiled portion, and a part of the inner wall of the coiled portion of the discharge pipe being open into the drum, substantially as specified.

ARTHUR O. LYNCH. GEO. \(V. CHRISTOPl-I.

Witnesses for Arthur C. Lynch:

E. E. CUNKLER, S. D. MAXWELL.

Witnesses for Geo. 7. Christoph:

H. R. WILLIAMS, Soorr H. SMITH. 

